|
putdevmod - put a device model description into the circuit database |
|
putdevmod [-e] file [...] |
|
-e |
Make an equivalence between the device and an existing object of viewtype 'layout' that has an identical name. |
|
Putdevmod(1ICD) places a device model description into the circuit database. One or more filenames may be given as argument, each containing exactly one device model description. For new projects with xcontrol use the program xcontrol to set and list the cell device status. In that case, the program putdevmod only adds the "devmod" file and does not set the device status. A device model description contains a description of the name of the device, a description of its terminals and (optionally) a simulation model for the device (currently only SPICE models are supported). The device model description is used by other programs to detect which cells are network primitives (e.g. by the layout-to-circuit extractor space(1ICD) and by programs that retrieve circuit descriptions from the database) and/or to collect simulation input. To remove a device model for a cell, use device(1ICD) with the option -u. The syntax of an input file for putdevmod is as follows: On the first line the keyword "device" is specified followed by the name of the device. On a next line the keywords "begin" and "spicemod" are specified to denote the beginning of the SPICE device information. The next lines are considered to be SPICE input that can directly be appended to a SPICE network description in order to form the model description of the device. The end of the SPICE model description is denoted by a line that contains the keyword "end". In the part of the input file that is used as SPICE input, the terminals, a possible bulk potential and a prefix for instance names for the device, may be included as SPICE comment. This is done by specifying them on lines that start with the comment character "*". To specify the terminals, use the keyword "terminals" followed - on the same line and separated by spaces and/or tabs - by the names of the terminals. The order in which the terminals are specified in this file must agree with the order in which the terminals are required in the SPICE circuit description (see the Spice User's Manual). The following terminal names are used for the standard devices: ""g", "d" and "s" for the gate, drain and source of field-effect transistors, ""c", "b" and "e" for the collector, base and emitter of bipolar transistors, and "n" and "p" for the terminals of resistors and capacitors. A bulk voltage (if appropriate) may be specified by the keyword "bulk" followed by a floating point number. A prefix character for the instance names of the device is specified by the keyword "prefix", followed by a character. By using putdevmod the user can easily perform extraction of devices that can not be recognized with the built-in device extraction algorithms of space(1ICD). A requirement for this is that the layout description of the device is stored in separate cell in the layout view. Using putdevmod a device model is then stored into the database that has a same name as the name of the layout cell and a list of terminals that is similar as, or a subset of, the list of terminals of the corresponding layout cell. The layout to circuit extractor space will consider these devices to be leaf-cells whose contents should not be extracted, but that should be included as primitives in the network description instead. |
|
An example of an input file for putdevmod is: device nenh begin spicemod |
|
* terminals |
d g s |
|
* bulk 0 |
|
* prefix |
m |
|
* parameters for n_enhancement NMOS w/l = 4/4 |
|
.model nenh nmos |
level=2 |
||||
|
+ |
vto=0.6838 |
kp=32u |
gamma=0.2787 |
||
|
+ |
phi=0.55 |
pb=0.84 |
cgso=440p |
||
|
+ |
cgdo=440p |
cgbo=100p |
rsh=25.3 |
||
|
+ |
cj=62u |
mj=0.73 |
cjsw=340p |
||
|
+ |
mjsw =0.20 |
js=6.2u |
tox=0.07u |
||
|
+ |
xj=0.35u |
ld=0.625u |
uo=650 |
||
|
+ |
ucrit=143000 |
uexp=0.154 |
utra=0 |
||
|
+ |
xqc=0.5 |
fc=0.6 lambda=0.02269 |
|||
|
+ |
vmax=6e4 |
nsub=5.71e14 |
|||
|
+ |
delta=5.5 |
|
end |
|
device(1ICD), macro(1ICD), space(1ICD), xspice(1ICD), User's guide for SPICE. |